JP2590366Y2 - Swash plate compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate compressor used for a refrigerator or a cooling machine.

[0002]

2. Description of the Related Art As an example of a conventional swash plate type compressor, there is a swash plate type compressor described in Japanese Patent Application Laid-Open No. 60-175783 by the same applicant as the present applicant.

This swash plate type compressor has a plurality of swash plates arranged in a crank chamber and a plurality of cylinders slidably arranged on a plurality of cylinders arranged in parallel with a shaft axis and on one surface side of the swash plate. A piston, a coupling mechanism for coupling the piston to the swash plate, and a hinge mechanism for supporting the swash plate on the shaft so that the inclination angle of the swash plate can be changed within a predetermined range. Adjusting means for adjusting the crank chamber pressure.

In this swash plate type compressor, a pair of sliding shoes having spherical surfaces on both surfaces of the swash plate are brought into contact with each other so as to be slidable along the circumference of the swash plate with the spherical surfaces facing outward. Constituting a mechanism, sandwiching the pair of sliding shoes at one end of the piston, connecting the piston to the swash plate, and rotating the shaft,
The swash plate is rotated, the piston reciprocates in the cylinder, and the crank chamber pressure is adjusted by the adjusting means to change the inclination angle of the swash plate, thereby changing the stroke amount of the piston. Like that.

[0005]

According to the challenges invention is to provide a such a conventional swash plate type compressor, swing plate, such as linked to the wobble plate piston by the rod swinging plate compressor becomes unnecessary. Therefore, the rocking rotation preventing mechanism of the rotation plate becomes unnecessary, can solve the vibration and noise problems which are caused by non-uniform property of the rotation preventing mechanism, along with superior properties for high speed is obtained, a compact compressor Has the advantage of being able to provide

However, in the above-described conventional swash plate compressor, only the piston on one side of the swash plate receives a side force as a gas compression component of the swash plate from the structure. There was a problem in terms of holding ability and durability. That is, a moment load is generated on the piston, and the side surface of the piston is apt to be unevenly worn, and the durability is not sufficient.To solve this, for example, measures such as lengthening the piston length are required. In that case, there is a problem that compactness is impaired.

The object of the present invention is to provide a compact
An object of the present invention is to provide a swash plate compressor having low noise and high durability.

[0008]

According to the present invention, a swash plate arranged in a crank chamber and a plurality of cylinders arranged substantially in parallel with a shaft axis and on one surface side of the swash plate are slidable. In the swash plate compressor having a plurality of pistons respectively arranged and a connection mechanism for connecting the piston to the swash plate, in the vicinity of the connection mechanism of each piston,
A swash plate type compressor is provided in which contact surfaces of the pistons adjacent to each other are provided.

[0009]

[Function] In the present invention, since the contact surfaces of the pistons adjacent to each other are provided in the vicinity of the coupling mechanism of the pistons, all the pistons can receive the side component of the compressive load of the specific piston. Becomes

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

First, the overall structure of a swash plate type compressor according to this embodiment will be described with reference to FIG.

As shown in FIG. 1, the swash plate type compressor according to this embodiment can slide on a swash plate 2 disposed in a crank chamber 1 and a plurality of cylinders 4 disposed in parallel with a shaft 3. And a connection mechanism 6 for connecting the piston 5 to the swash plate 2.

The piston 5 has a driving portion 5a behind it, and spherical grooves 5b, 5c formed inside the driving portion 5a have sliding shoes 7a, 7 having spherical surfaces.
b interposes the swash plate 2 so that the rotational motion of the swash plate 2 is controlled by the sliding shoes 7a, 7b, the spherical grooves 5b, 5c, and the reciprocating motion of the piston 5 by the drive unit 5a. Is converted. The swash plate 2 is supported so that its inclination angle can be freely changed, and the pressure in the crank chamber 1 is reduced.
The adjustment by the pressure control valve 8 allows the piston 5
The required swash plate inclination angle can be set by controlling the gas pressure load applied to the piston, thereby obtaining a desired piston stroke.

On the other hand, the gas compression load from the piston 5 is transmitted to the swash plate 2 via the shoe 7b. In the compression step, the piston 5 is lifted by the slope effect of the swash plate 2. At this time, a gas compression component from the piston 5 is applied to the driving portion 5a of the piston 5 in the rotational tangential direction of the slope of the swash plate. Occurs. Then, the driving portion 5a of the piston generates a bending moment that is bent in the side direction by the component force.

In the conventional example described above, this moment causes an abnormal increase in the sliding load on the side of each piston, which is located at the lower side of the cylinder and cannot provide a sufficient supporting force by the cylinder, resulting in wear and breakage. This may cause the problem described above.

The swash plate type compressor according to the present embodiment has the following configuration in order to solve this problem.

In the swash plate type compressor according to this embodiment,
As shown in FIG. 2 and FIG.
(See FIG. 1) Projecting portions 5d are formed symmetrically in the vicinity, that is, on both sides of the driving portion 5a at the rear end of each piston 5. These protruding portions 5d are provided with contact surfaces 5e of the pistons 5 adjacent to each other. The contact surface 5e has a shape such that adjacent pistons come into contact with each other. The pistons 5 are shifted from each other by a phase difference of 2π / n (n: the number of pistons), and their axial stroke positions are also distributed with a phase difference of 2π / n. When the number n of pistons is large, the axial displacement is small, and even if the contact surface 5e is not too long, a sufficient contact area can be obtained between the surfaces adjacent to each other. Of these pistons 5, those which are in the gas compression step and whose side faces receive the component force of the gas compression load transfer the side force to the adjacent piston via the contact surface 5e. The piston 5 is transferred to the next piston 5 via the contact surface 5e, so that all the pistons 5 receive side loads. Each piston 5 basically applies a side force to the cylinder block 4a with the cylinder surface 4b and the auxiliary sliding surface 4c.
Approximately half of the pistons 5 are located sufficiently within the cylinder 4 so that the pistons 5 have a value sufficient to receive the above-described total side force. Piston 5 that is fully contained in cylinder 4
Will be supported by In the embodiment, the variable displacement type swash plate type compressor is described. However, the present invention can be applied to a fixed displacement type swash plate type compressor in which the inclination angle of the swash plate is constant.

[0018]

As described above, according to the present invention, since the contact surfaces of the adjacent pistons are provided near the coupling mechanism of the pistons, the side faces of the compression load of the specific pistons are provided. The component force can be received by all pistons.

Therefore, it is possible to improve the durability against the moment generated in the piston. Also, since it is not necessary to increase the length of the piston, a compact swash plate compressor can be provided. Further, since the structure has a well-balanced load, generation of vibration and noise can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a swash plate type compressor according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a part of an arrangement of pistons in the swash plate compressor of FIG.

FIG. 3 is a perspective view showing one of the pistons in the swash plate type compressor of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crank chamber 2 Swash plate 3 Shaft shaft 4 Cylinder 5 Piston 5a Drive part 5b, 5c Groove part 5d Projection part 5e Contact surface 6 Connection mechanism 7a, 7b Sliding shoe

Claims (1)

(57) [Scope of request for utility model registration] A swash plate arranged in a crankcase; a plurality of pistons each being slidably mounted on a plurality of cylinders substantially parallel to a shaft axis and arranged on one surface side of the swash plate; In a swash plate type compressor having a connecting mechanism for connecting a piston to the swash plate, a contact surface between the pistons adjacent to each other is provided near the connecting mechanism for each piston. Swash plate type compressor.